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The work functions for metal $\mathrm{a}, \mathrm{b}$ and c are respectively $1.92 \mathrm{eV}, 2.0 \mathrm{eV}$ and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength $4100 Å$ is a/are:
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'a' and 'b' only
Energy of photon $=\frac{12400}{4100}=3 \mathrm{eV}$
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